Windows and Doors



Circa 5-10% of heat is lost through windows.
For many years there has been a trend to remove existing timber casement and sash windows, and replace them with uPVC. 
If you are considering removing your existing windows we would recommend that you reconsider.  From an environmental aspect, your timber windows are likely to have many years of serviceable life left in them.  In addition, the manufacture of uPVC is an unfriendly environmental process.
You may be considering removing your timber windows because they need to be repaired, they let in drafts, or they 'stick' when trying to open.  All of these issues can usually be addressed - damaged timber can usually be cut out and replaced, draughts can be reduced or eliminated, and years of paint can easily be removed to ensure that they open easily.
Your existing windows can be double glazed using two main systems.  These comprise installing secondary glazing (this system usually applies to conservation areas), or removing the glass from the existing frame and preparing it to receive a double glazed unit (these improvements can also be applied to sash windows).  
We would also install invisible draught seals to your windows.  These will either considerably reduce or eliminate draughts, depending on your type of window.
Finally, homes in mainland Europe are now having triple glazed windows installed.  These provide superior levels of thermal insulation and protection from draughts.
Circa 15% of heat is lost through external doors.
Beautiful though they may be, your existing door and frame are likely to be very thermally inefficient. 
A basic way to increase thermal efficiency comprises draught proof seals around the frame, seals around the letter box, and a specially made insulated thermal curtain behind the door. 
The most thermally efficient option is to replace the door and frame with ones which are fully insulated and draught proofed.   


Costs and benefits for 'B' rated Doors and Windows are a cost of 2,500-3,100, giving annual savings of 165.  The payback period is up to 19 years, with annual carbon savings of 680kg*.
If you would like to view the blog on the green conversion and renovation of a Victorian London apartment, click here.


*Energy Saving Trust 2011  2007 Privacy Policy Terms of Use